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8/17/2019 Epithelial Tissue Ss
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EPITHELIAL TISSUE Epithel: Epi = Upon
Thele = Nipple
Composed of closely aggregatedpolyhedral cell ith !ery little
e"tracell#lar s#$stance% &i'erentiation of ectoderm(
mesoderm and endoderm%
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THE P)INCIPLE
*UNCTI+NS: Co!ering and lining of s#rfaces
A$sorption
Secretion
Sensation
Contractility
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THE *+),S +* EPITHELIAL
CELL
Col#mnar
C#$oidal
S-#amo#s
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.ASAL LA,INAE /isi$le ith the electron microscope Consisting of: lamina densa
lamina rarae/lucidae *o#nd here other cell types come into
contact ith connecti!e tiss#e%
The term 0Basal Membran1 = #sed tospecify a PAS2positi!e layer( !isi$le ithlight microscope
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INTE)CELLULA)
3UNCTI+NS The functions:
2 As site of adhesion2 As seals to pre!ent the 4o of
materials thro#gh the intercell#lar space
2 Pro!ide a mechanism for comm#nication
$eteen ad5acent cells
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The classication of intercellular
junctions:
2 Adhering 5#nctions 6 Zonulae adherentes,
hemidesmosomes, desmosomes/maculaadherentes7%
2 Impermea$le 5#nctions6 Zonulaeoccludens/ tight junctions7
2 Comm#nicating 5#nctions 68ap 5#nctions7
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Intercellular JunctionIntercellular Junction
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SPECIALI9ATI+N +* THE
CELL SU)*ACE
,icro!illi
Stereocilia
Cilia 4agella
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Cilia
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Microvilli
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Stereocilia
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T;PES +* EPITHELIAAccording to their structure
and
functions:
Co!ering epithelia 8land#lar epithelia
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C+,,+N T;PES +*
C+/E)IN8 EPITHELIA Simple epitheli#m
2 S-#amo#s
2 C#$oidal2 Col#mnar
Pse#dostratied72 C#$oidal2 Transitional
2 Col#mnar
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Stratified squamous epithelium
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Simple Cuboid Epithelium
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Simple Columnar Epithelium
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Pseudostratified Columnar Ciliated Epithelium
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Stratified squamous epithelium
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Stratified squamous keratinizing
epithelium
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Stratified cuboidal epithelium
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Transitional epithelium
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T;PES +* 8LAN&ULA)EPITHELIA
Endocrine
Exocrine
2 Simple gland 6tubular,coiled
tubular,branched tubular,acinar 7
2 Compo#nd gland 6 tubular,acinar, tubuloacinar 7
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Eocrine !land T"pes
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According to the ay in hich
the secretory prod#cts lea!ethe cell( gland can $e classi